The walk from Swan to Boardwalk Inn is very quick, since the Swan is at the base of the bridge. I didn't mind walking to their bus at all. Basically the same as walking back to your room at a value or moderate
The walk feels a lot longer at the Dolphin, especially if your room is far from the lobby. I never noticed how much shorter the walk is when staying at the Swan until I actually stayed there. I will be honest, I utilize Uber/Lyft a lot when staying at the S/D. So much quicker for them to pick up and drop off with no guard checking IDs. Could get pretty much anywhere on property for $10 other than MK obviously. I always enjoy the walk along the Boardwalk in the mornings and evenings anyways. Often grab something to go from the BW Deli as well!
I love the AK bus at the S/D though, such a close drop off and love the seating when waiting for pick up. I've stayed at the S/D maybe 5 times in the past few years...never waited more than 10 minutes for an AK bus in either direction.